General clean-up. Fixed GateKeeper, updated startup scripts, fixed warnings.

src/com/droidquest/items/GateKeeper.java

@@ -64,7 +64,7 @@ public class GateKeeper extends Item {
 
     public void Animate() {
         if (behavior == 1) {
-            if (x != goToX && y != goToY) {
+            if (x != goToX || y != goToY) {
                 if (x != goToX) {
                     int diff = Math.abs(goToX - x);
                     int dir = diff / (goToX - x);

src/com/droidquest/items/Sentry.java

@@ -240,9 +240,11 @@ public class Sentry extends Item {
 
         if (behavior == -1) {
             if (carrying == null) {
-                x = robot.x + robot.width / 2 - width / 2;
-                y = robot.y + robot.height / 2 - height / 2;
-                PicksUp(robot);
+                if(robot != null) {
+                    x = robot.x + robot.width / 2 - width / 2;
+                    y = robot.y + robot.height / 2 - height / 2;
+                    PicksUp(robot);
+                }
             }
         }
 

src/com/droidquest/materials/BatteryIn.java

@@ -13,7 +13,7 @@ import com.droidquest.levels.Level;
 public class BatteryIn extends Material {
     // Charges the Battery when an Energy Crystal is passed over it.
 
-    public void BatteryIn() {
+    public BatteryIn() {
         passable = true;
         GenerateIcons();
     }